A simple carbohydrate is
A. a monomer.
B. a building block of proteins.
C. a complex of multiple monomers.
D. all of the above

The answer would be D

Explanation:

Carbohydrates supply energy with foods that have proteins, sugars and so on, they have polysachrides.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.

it's c.us forest service